By E. Merck, Henry Schenk
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Additional resources for chemical reagents their purity and tests
The distillate must be tested with ammonium molybdate solution for phosphoric acid.. 28 CHEMICAL REAGENTS drops of decinormal potassium permanganate solution to a mixture of 5 cc. of phosphoric acid and 5 cc. of diluted sulphuric acid, and then heating for five minutes at 100° C , the red color of the liquid should not disappear. Arsenic. — A Marsh apparatus is started using 20 gm. of arsenic-free, granulated zinc, and diluted (1:5) sulphuric acid. A mixture of 3 cc. of phosphoric acid with 20 cc.
TESTS OF PURITY The tests to be made are those given under Acid Phosphoric sp. gr. 7. But for 1 cc. of the phosphoric acid sp. gr. 7, use 4 cc. of the phosphoric acid sp. gr. 12. * Methyl orange may be used instead of phenolphthalein. In this case, however, 1 cc. 09802 gm. of H 5 part of boiling, water. The aqueous solution is slightly alkaline to litmus paper.
5 part of boiling, water. The aqueous solution is slightly alkaline to litmus paper.